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Try removing the M/W turntable and placing a shallow bowl upside down centered over the rotating device. Then place your plate on top of the bottom of the bowl. The device will still rotate but will not be in contact with anything.

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You can find an exploded view of your microwave at http://www3.sears.com (yes, the 3 is there).
Ref # 3009 on the drawing is the turntable motor.
I would grab it by the shaft and gently try to turn it. If it's locked up or grinding, that's a sign it's bad.
It runs $24.49 plus shipping:
Part Description: Quantity: Part Number: Model Number: Price:
TT MOTOR 6549W1S013D 721.64663300 $ 24.49 $ 24.49
Be sure to unplug the oven before you work on it. Hope this helps!